Question

我有一个带有奇怪行为的mapView：当我打开它时，一切正常。将找到用户（蓝色圆圈）并且3个针脚就位。但是（我不知道为什么）经过一段时间后，蓝点变成了一个引脚 - 但只有当我的连接速度很慢时。

这是我得到的：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];

    if (!pinView && ![annotation isKindOfClass:[MKUserLocation class]])
    {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;

        if (annotation == self.locationZH1)
        {
            [pinView setTag:1];
        }
        else if (annotation == self.locationZH2)
        {
            [pinView setTag:2];
        }
        else if (annotation == self.locationZH3)
        {
            [pinView setTag:3];
        }
        else if (annotation == self.locationLU1)
        {
            [pinView setTag:4];
        }
    }
    else
    {
        pinView.annotation = annotation;
    }

    return pinView;
}

Answer 1

请务必避免为内置用户位置标记提供注释视图。

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    //check annotation is not user location
    if([annotation isEqual:[mapView userLocation]])
    {
        //bail
        return nil;
    }

    static NSString *annotationViewReuseIdentifer = @"map_view_annotation";

    //dequeue annotation view
    MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationViewReuseIdentifer];

    if(!annotationView)
    {
        annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationViewReuseIdentifer];
    }

    //set annotation view properties
    [annotationView setAnnotation:annotation];

    return annotationView;
}

通过先检查用户位置注释，您可以提前返回nil，而不是分配新的MKPinAnnotationView并返回。{/ p>

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation州的文档：

如果注释参数中的对象是。的实例 MKUserLocation类，可以提供自定义视图来表示用户的位置。使用默认值显示用户的位置系统视图，返回nil。

Answer 2

Swift 3解决方案：

if annotation is MKUserLocation{
    return nil
}

Answer 3

您需要在注释== mapView.userLocation时返回nil，以显示用户位置的蓝点及其周围的圆圈

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id      <MKAnnotation>)annotation

    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView  dequeueReusableAnnotationViewWithIdentifier:@"pinView"];

    if (!pinView && ![annotation isKindOfClass:[MKUserLocation class]])
    {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;

        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;

        if (annotation == self.locationZH1)
        {
            [pinView setTag:1];
        }
        else if (annotation == self.locationZH2)
        {
            [pinView setTag:2];
        }
        else if (annotation == self.locationZH3)
        {
            [pinView setTag:3];
        }
        else if (annotation == self.locationLU1)
        {
            [pinView setTag:4];
        }
        return pinView;
    }
    else
    {
        pinView.annotation = annotation;
        return Nil;
    }
}

iOS：用户位置变为pin

3 个答案: